Computers and Technology, 06.03.2021 02:10, diablo871
Suppose an operating system attempts to approximate SRTF with a priority scheduler based on observing how existing threads and assuming that future CPU bursts will have similar lengths to prior CPU bursts. It observes the following schedule:
at time 0: A, B, and C and are all waiting for an I/O operation
at time 1: thread A finishes the I/O operation and starts using the processor
at time 2: thread B finishes the I/O and starts using the processor (preempting thread A)
at time 10: thread B starts another I/O operation and gives up the processor
at time 10: thread A resumes using the processor
at time 11: thread C finishes an I/O operation and becomes runnable (but does not preempt thread A)
at time 12: thread A starts another I/O operation and gives up the processor
at time 12: thread C starts using the processor at time 13: thread C starts another I/O operation and gives up the processor
Suppose at time 14 A, B, and C all simulatenously finishes their I/O operations. Based on the observed schedule above, in what order should the OS run them on the processor to best approximate SRTF?
a. A, then B, then C
b. A, then C, then B
c. B, then A, then C
d. B, then C, then A
e. C, then A, then B
f. C, then B, then A
Answers: 1
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Suppose an operating system attempts to approximate SRTF with a priority scheduler based on observin...
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